/*
 * Created on Apr 30, 2004
 * Created by Alon Rohter
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.peermanager.messaging.bittorrent;

import org.gudy.azureus2.core3.util.DirectByteBuffer;
import org.gudy.azureus2.core3.util.DirectByteBufferPool;

import com.aelitis.azureus.core.peermanager.messaging.Message;
import com.aelitis.azureus.core.peermanager.messaging.MessageException;

/**
 * NOTE: Overrides equals()
 */
public class BTRejectRequest implements BTMessage {
    private byte version;
    private DirectByteBuffer buffer = null;
    private String description = null;

    private final int piece_number;
    private final int piece_offset;
    private final int length;
    private final int hashcode;

    public BTRejectRequest(int piece_number, int piece_offset, int length, byte version) {
        this.piece_number = piece_number;
        this.piece_offset = piece_offset;
        this.length = length;
        this.version = version;
        this.hashcode = piece_number + piece_offset + length;
    }

    public int getPieceNumber() {
        return piece_number;
    }

    public int getPieceOffset() {
        return piece_offset;
    }

    public int getLength() {
        return length;
    }

    public String getID() {
        return BTMessage.ID_BT_REJECT_REQUEST;
    }

    public byte[] getIDBytes() {
        return BTMessage.ID_BT_REJECT_REQUEST_BYTES;
    }

    public String getFeatureID() {
        return BTMessage.BT_FEATURE_ID;
    }

    public int getFeatureSubID() {
        return BTMessage.SUBID_BT_REJECT_REQUEST;
    }

    public int getType() {
        return Message.TYPE_PROTOCOL_PAYLOAD;
    }

    public byte getVersion() {
        return version;
    };

    public String getDescription() {
        if (description == null) {
            description = BTMessage.ID_BT_REJECT_REQUEST + " piece #" + piece_number + ":" + piece_offset + "->" + (piece_offset + length - 1);
        }

        return description;
    }

    public DirectByteBuffer[] getData() {
        if (buffer == null) {
            buffer = DirectByteBufferPool.getBuffer(DirectByteBuffer.AL_MSG_BT_REJECT_REQUEST, 12);
            buffer.putInt(DirectByteBuffer.SS_MSG, piece_number);
            buffer.putInt(DirectByteBuffer.SS_MSG, piece_offset);
            buffer.putInt(DirectByteBuffer.SS_MSG, length);
            buffer.flip(DirectByteBuffer.SS_MSG);
        }

        return new DirectByteBuffer[] { buffer };
    }

    public Message deserialize(DirectByteBuffer data, byte version) throws MessageException {
        if (data == null) {
            throw new MessageException("[" + getID() + "] decode error: data == null");
        }

        if (data.remaining(DirectByteBuffer.SS_MSG) != 12) {
            throw new MessageException("[" + getID() + "] decode error: payload.remaining[" + data.remaining(DirectByteBuffer.SS_MSG) + "] != 12");
        }

        int num = data.getInt(DirectByteBuffer.SS_MSG);
        if (num < 0) {
            throw new MessageException("[" + getID() + "] decode error: num < 0");
        }

        int offset = data.getInt(DirectByteBuffer.SS_MSG);
        if (offset < 0) {
            throw new MessageException("[" + getID() + "] decode error: offset < 0");
        }

        int length = data.getInt(DirectByteBuffer.SS_MSG);
        if (length < 0) {
            throw new MessageException("[" + getID() + "] decode error: length < 0");
        }

        data.returnToPool();

        return new BTRejectRequest(num, offset, length, version);
    }

    public void destroy() {
        if (buffer != null)
            buffer.returnToPool();
    }

    // used for removing individual requests from the message queue
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj != null && obj instanceof BTRejectRequest) {
            BTRejectRequest other = (BTRejectRequest) obj;
            if (other.piece_number == this.piece_number && other.piece_offset == this.piece_offset && other.length == this.length)
                return true;
        }
        return false;
    }

    public int hashCode() {
        return hashcode;
    }
}
